this post was submitted on 16 Jan 2025
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Once you share a file with someone, they already have it. There's no point in trying to make them unable to view it after the fact.
Sharing != downloading forever. When you browse it, yes, technically it's in your cache, but that's why it's called a cache. Most people won't install a client that puts their browsing into long-term storage (unless Microsoft takes a screenshot for them and promises never to upload it somewhere). Regardless, it is still a security issue (as I just described with releasing the encryption key). You can choose to ignore it, until someone comes along and exploits it. Then you have a bunch of angry people screaming at you because you "didn't close an obvious security hole".
Anti Commercial-AI license
You realize you can download it forever at any point, right? Your threat model should be "anyone you share things to has saved them forever"
Once you give up trying to unshare things, then encrypted group chats make a lot of sense.
I'm not sure if you're intentionally missing the point or not. We're not talking about encrypted group chats. We're talking about encrypted Facebook. The amount and type of data involved is very different, so is how long the data will be retained.
But sure, if you want to ignore unsharing things, go ahead. Let's see how that'll work out for you 🤷
Anti Commercial-AI license
It will unshare the thing in the UI only, which is enough for regular people. Again, once you share it, it's out there